When viewing "My Tracks" up and down arrows affect the window behind

Description

To reproduce:
Open Potlatch2
Select "My Tracks" from the top left
Attempt to scroll down (or up) the list with the arrow keys

Nothing obvious seems to happen, but in fact the (smudged-out) map behind is moving. When the "My Tracks" box is closed, you're somewhere that you don't expect to be.

If the arrow keys are supposed to move the map behind then it presumably shouldn't be smudged-out? Also some kind of clue about what the arrow keys do here would be useful. If they're not, how about making them just, er, scroll up and down the list in the foreground?